The title compound, [6-(4-aminobenzyl)-1,11-diaza-4,8-diazanidacyclotetradecane-5,7-dione(2-)-kappa(4)N(1,4,8,11)]- nickel(II), [Ni(C17H25N5O2)], has mirror symmetry with Ni-N(amide) and Ni-N(amine) bond distances of 1.862 (5) and 1.925 (5) Angstrom, respectively. The aromatic ring of the side chain is tipped 21.3 (3)degrees towards the plane containing the Ni and four N atoms. The distance from the Ni atom to the center of the aromatic ring is 3.551 (5) Angstrom.